From 32f68bef2ed3dbc733b06b61d0c74d0b62782518 Mon Sep 17 00:00:00 2001
From: Philip Withnall <pwithnall@gnome.org>
Date: Thu, 10 Apr 2025 11:48:09 +0100
Subject: [PATCH] build: Enable -Wundef warning by default
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We prefer `#ifdef` to `#if` in code, so let’s use the `-Wundef` warning
to enforce that. In CI, `-Werror` is enabled, so this should be
enforcement enough.

Suggested by Thomas Haller.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>
---
 meson.build | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/meson.build b/meson.build
index b11151d28..119651471 100644
--- a/meson.build
+++ b/meson.build
@@ -579,6 +579,8 @@ if cc.get_id() == 'gcc' or cc.get_id() == 'clang'
     '-Wmissing-field-initializers',
     '-Wnonnull',
     '-Wnull-dereference',
+    # We prefer #ifdef to #if
+    '-Wundef',
     '-Wunused',
     # Due to maintained deprecated code, we do not want to see unused parameters
     '-Wno-unused-parameter',